Update SLX Contact Level Using Scribe

My source is an Excel file of updated addresses from our mailing house. My Scribe dts will update the Account level address but I'm having trouble updating the contact level addresses as there are more than one contact per Account. Any suggestions?

You should have taken the contact.addressid into Excel - that way, you could have identified the actual address to update. It's the same for account in fact so you have the same issue (both contact and address are 1:M per entity). You don't really have anywhere to go from here - as an assumption that the contacts' address is the same as the account is not correct.